Adding LTSPICE directives

Using the menu bar:
Select Edit -> Spice directive from the main menu bar

Using the context menu:
Right-click in the schematic window, select Edit simulation Cmd. A dialog box will open for you to enter the LTSPICE directive. If you want to add multiple LTSPICE directives, start each directive on a new line, using CTRL-M (German keyboard: Strg-M) to start a new line.